EP3711367B1 - Répartition implicite temporelle de charge d'accès au réseau - Google Patents

Répartition implicite temporelle de charge d'accès au réseau Download PDF

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Publication number
EP3711367B1
EP3711367B1 EP18800632.4A EP18800632A EP3711367B1 EP 3711367 B1 EP3711367 B1 EP 3711367B1 EP 18800632 A EP18800632 A EP 18800632A EP 3711367 B1 EP3711367 B1 EP 3711367B1
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Prior art keywords
access
wireless device
network
network access
prach
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German (de)
English (en)
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EP3711367C0 (fr
EP3711367A1 (fr
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Andreas HÖGLUND
Yutao Sui
Olof Liberg
Yi-Pin Eric Wang
Johan Bergman
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1642—Formats specially adapted for sequence numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Definitions

  • the present invention relates generally to wireless communication networks, and in particular to temporal load distribution of network access procedures by wireless devices.
  • Machine type communication is a class of wireless connectivity for devices which communicate without human interaction. That is, providing cellular connectivity for the Internet of Things (IoT). It is predicted to increase the number of connections exponentially more than the increase of human subscriptions and the number of fixed connections. This is sometimes referred to as 'the networked society.' Because of the different nature of MTC devices, the requirements are also different from those of human-oriented traffic, such as smart phones. MTC devices need to have low cost, which is achieved by low User Equipment (UE) complexity and reduced capabilities (one receiving antenna, a narrow device bandwidth smaller than the system bandwidth, etc.). The power consumption should further be low in order to prolong battery life such that interactive battery charging is not required, preferably throughout the life span of the device.
  • UE User Equipment
  • LTE-MTC (here also referred to LTE-M or eMTC for any release), although some features for MTC were introduced already in Rel-11 (Enhanced Access Class Barring, EAB), and Rel-12 (Cat-0), the main changes of reduced device bandwidth support and coverage enhancements (CE) were introduced in Rel-13 for UE Cat-M1.
  • CE support of up to 15 dB is achieved by time repetition in a Transmission Time Interval (TTI) bundling manner, similar to that introduced for Voice over Internet Protocol (VoIP) in Rel-8.
  • TTI bundling is limited to the uplink shared data channel and fixed to 4 repetitions.
  • the number of repetitions can be configured per cell or per UE and will also be applied to the downlink. Up to 2048 repetitions for Physical Uplink Shared Channel (PUSCH) and Physical Downlink Shared Channel (PDSCH) support CE even larger than that of the initial 15 dB design target.
  • PUSCH Physical Uplink Shared Channel
  • PDSCH Physical Downlink Shared Channel
  • RA random access
  • 4 different CE-levels were introduced, i.e. 4 different Physical Random Access Channel (PRACH) configurations with different repetition levels.
  • PRACH Physical Random Access Channel
  • the UE selects a PRACH resource with a CE-level matching its coverage requirement based on Reference Signal Received Power (RSRP) measurement.
  • RSRP Reference Signal Received Power
  • the lower complexity of the devices means that a small number of repetitions might be needed also for these devices in normal coverage, i.e., to compensate for the losses from using only one receiving antenna, loss of frequency diversity, etc.
  • cross-subframe scheduling is used as part of the complexity reduction and CE. That is, a transmission is first scheduled by repetitions on MPDCCH and then the repetitions of the actual data transmission (PUSCH or PDSCH) are carried out at first after the final MPDCCH repetition.
  • CE mode A supporting a small number of repetitions (up to 32 for shared data channels), and CE mode B supporting a large number of repetitions (up to 2048 for shared data channels).
  • CE mode B supporting a large number of repetitions (up to 2048 for shared data channels).
  • the UE is configured with CE mode A or B will mean it used different configurations for, e.g., Random Access, MPDCCH monitoring, PDSCH transmissions, etc. That is, different search spaces and frequency hopping parameters apply.
  • Random Access the four CE levels are divided such that CE-level 0 and CE-level 1 use CE mode A configuration, whereas the higher CE-levels 2 & 3 use CE mode B configuration.
  • Rel-14 LTE-M was further enhanced with a number of features and the introduction of a wider bandwidth UE category, Cat-M2, supporting higher data rates with a bandwidth of 5 MHz or 24 PRBs.
  • NB-loT was introduced in 3GPP in Release 13 and supports enhancements to support Machine-Type Communications (MTC) with a new radio interface (and UE categories Cat-NB1 and Cat-NB2). (The notation NB-loT is here used for any Release).
  • NB-loT For NB-loT, three different operation modes are defined, i.e., stand-alone, guard-band, and in-band.
  • stand-alone mode the NB-loT system is operated in dedicated frequency bands.
  • the NB-loT system can be placed inside the frequency bands used by the current LTE system, while in the guard-band mode, the NB-loT system can be operated in the guard band used by the current LTE system.
  • NB-loT can operate with a system bandwidth of 180 kHz (Cat-NB1, Cat-NB2).
  • NB-loT supports multi-carrier operation, where several 180 kHz PRBs can be used, e.g., for increasing the system capacity, inter-cell interference coordination, load balancing, etc.
  • the NB-loT device listens to the system information on the anchor carrier, but when there is data, the communication can be moved to a secondary carrier.
  • Rel-13 UEs need to use the anchor carrier for random access whereas Rel-14 UEs may use the non-anchor carriers if configured. Otherwise, such as when attempting to access the network for attach, Rel-14 UEs also need to use the anchor carrier.
  • Anchor carrier configuration such as the radio resource configuration, uplink carrier frequency, random access parameters, paging configuration, and the static physical layer parameters, are done in SIB2-NB while non-anchor carriers are configured by SIB22-NB.
  • the parameter maxNonAnchorCarriers-NB-r14 defines the maximum number of non-anchor carriers supported in Release 14; the maximum is 15 in addition to the anchor carrier.
  • the UE in RRC_CONNECTED mode can be configured, via UE-specific Radio Resource Control (RRC) signaling, to a non-anchor carrier, for all unicast transmissions.
  • RRC Radio Resource Control
  • the UE in RRC_IDLE mode based on broadcast signaling, can use a non-anchor carrier for paging reception and/or PRACH access. If the non-anchor carrier is not configured for the UE, all transmissions occur on the anchor carrier.
  • NB-loT uses repeated transmissions to extend its coverage compared to earlier supported 3GPP radio access technologies.
  • a UE may for example repeat the Narrowband Physical Random Access Channel (NPRACH) preamble transmission up to 128 times to achieve coverage in the most demanding situations.
  • NPRACH Narrowband Physical Random Access Channel
  • the NB-loT radio interface has therefore been designed with three separate NPRACH radio resources that each is associated with a coverage range and a set of repetitions. That is, CE-levels 0, 1, and 2 are supported, unlike eMTC which supports 4.
  • the UE selects the CE-level and NPRACH resource in the same manner based on RSRP measurements.
  • Figure 1 illustrates a typical NPRACH configuration with three resources for Coverage Enhancement level 0 (CE0), 1 (CE1) and 2 (CE2).
  • the left most NPRACH resource (CE0) is intended for UEs in good radio conditions, where the random access preamble is sent a single time.
  • the system may configure two additional NPRACH resources to be used by UEs in extended and extreme coverage.
  • Each NPRACH resource is associated with a Coverage Extension (CE) level.
  • CE level is furthermore associated with a set of repetitions of the random access preamble transmission. The number of repetitions increases with the coverage intended to be supported by the NPRACH resource.
  • Figure 1 depicts CE1 spanning 12 subcarriers and comprising (up to) 8 repetitions. In a more severe environment, CE2 also spans 12 subcarriers, but comprises up to 32 repetitions.
  • the UE measures the downlink received power (RSRP) and based on this and a set of broadcasted signal level thresholds, makes a selection of the NPRACH resource to use for its system access, i.e. the number of times the random access frequency hopping symbol group should be repeated.
  • RSRP downlink received power
  • LoRa, Sigfox, and Ingenu are three wide-area loT solutions that have been deployed in certain markets. These solutions are very uplink-oriented, as they can work even without a downlink. They can also work without the frame structure, i.e. no notion of subframe, frame, hyperframe, etc. In these systems, a UE which has data to send can simply send the data without any uplink grant. Such uplink grant-free access is vulnerable to potential collision at high traffic loads. Furthermore, in these systems, the uplink data is transmitted in Msg1.
  • uplink transmissions are not user initiated but instead initiated by the software running in the device or triggered by events, e.g. from sensor readings in the device. Since large numbers of devices will be running the same software, or are triggered by the same event, there is a large risk for synchronized access peaks. That is, a large number of UEs will attempt to access the network at the same time leading to congestion and poor performance.
  • Us 2012/281679 A1 discloses a solution for sharing random access parameters.
  • a plurality of terminal devices shares the same random access parameters, e.g. the random access preamble sequence, and different transmission opportunities are assigned to the terminal devices.
  • the different transmission opportunities are used to distinguish the terminal devices in the random access procedure.
  • the PRACH or NPRACH (together referred to herein as (N)PRACH) load (i.e ., Msg1) is temporally distributed, to better handle synchronized access peaks from machine type devices. Access attempts by UEs are distributed in time, based on their UE identities (e.g. , International Mobile Subscriber Identity, or IMSI, which is used for the distribution of paging load) or random draw. The distribution restricts when UEs can access the network, either based on System Frame Number (SFN) or on random access occurrence.
  • SFN System Frame Number
  • the method is implicit, i.e., after the initial System Information (SI) acquisition, UEs will automatically apply access load distribution according to the configuration provided in SI without any need for explicit signaling or re-acquisition of SI.
  • SI System Information
  • embodiments are described herein in terms of NB-loT and LTE-M implementations, the invention is not so limited, and may be advantageously applied to any wireless communication network supporting machine type communications, such as GPRS/EGPRS/EC-GSM-loT and UMTS/HSPA, as well as non-3GPP radio access technologies such as LoRa, Sigfox, and Ingenu.
  • Embodiments presented here comprise methods to spread the access load, i.e., Msg1 or (N)PRACH, in time when many UEs attempt to access the network simultaneously (or near-simultaneously), causing a synchronized access peak. They can be based on any UE property that differs, such as the UE_ID, e.g., pseudo-random SAE-Temporary Mobile Subscriber Identity (S-TMSI) or IMSI (the latter is currently used for distributing the paging load).
  • S-TMSI pseudo-random SAE-Temporary Mobile Subscriber Identity
  • IMSI the latter is currently used for distributing the paging load.
  • the NPRACH resource on the anchor carrier is defined by the Information Element (IE) NPRACH-ConfigSIB-NB (See 3GPP TS 36.331 V14.4.0). In this IE, all the NPRACH resources are configured, up to three, corresponding to CE-levels 0, 1, and 2.
  • IE Information Element
  • Corresponding RSRP thresholds are given for each CE level, in order for UEs to select the NPRACH resource with a number of repetitions suitable for the UE's coverage (RSRP thresholds are given by the IE rsrp-ThresholdsPrachInfoList-r13, and the number of repetitons in the range ⁇ n1, n2, n4, n8, n16, n32, n64, n128 ⁇ by the IE numRepetitionsPerPreambleAttempt-r13 ).
  • the reoccurrence of a NPRACH occurrence is defined by the IE nprach-Periodicity-r13 which has the range ⁇ ms40, ms80, ms160, ms240, ms320, ms640, ms1280, ms2560 ⁇ , and the IE nprach-StartTime-r13 which has the range ms8, ms16, ms32, ms64, ms128, ms256, ms512, ms1024 ⁇ .
  • nprach-Periodicity configures the periodicity of the NPRACH resource
  • nprach-StartTime can provide a cell-specific time offset to reduce inter-cell interference
  • the NPRACH resources are configured by the Information Element (IE) PRACH-Config (See TS 36.331).
  • IE Information Element
  • PRACH-Config See TS 36.331.
  • the Rel-13 extensions specify the behavior of Cat-M1 UEs and the use of repetitions for coverage enhancements.
  • rsrp-ThresholdsPrachInfoList-r13 defines the RSRP thresholds for the PRACH CE-level selection for the UE.
  • the parameter PRACH-ParametersListCE specifies the configuration parameters for up to four CE-levels. For each PRACH resource a number of repetions in the range ⁇ n1,n2,n4,n8,n16,n32,n64,n128 ⁇ is defined.
  • a PRACH configuration configured by higher layers with a PRACH configuration index ( prach-ConfigurationIndex ), a PRACH frequency offset n ⁇ PRBoffset RA ( prach-FrequencyOffset ), a number of PRACH repetitions per attempt N rep PRACH ( numRepetitionPerPreambleAttempt ) and optionally a PRACH starting subframe periodicity N start PRACH ( prach-StartingSubframe ).
  • the PRACH periodicity is determined by the prach-ConfigurationIndex. How PRACH is transmitted is indicated in Table 5.7.1-2 of TS 36.211.
  • An extract for preamble format 0 is given below for better context: Table 1: Extract of PRACH configuration index for preamble 0 from TS 36.211.
  • PRACH Configuration Index Preamble Format System frame number Subframe number 0 0 Even 1 1 0 Even 4 2 0 Even 7 3 0 Any 1 4 0 Any 4 5 0 Any 7 6 0 Any 1, 6 7 0 Any 2 ,7 8 0 Any 3, 8 9 0 Any 1, 4, 7 10 0 Any 2, 5, 8 11 0 Any 3, 6, 9 12 0 Any 0, 2, 4, 6, 8 13 0 Any 1, 3, 5, 7, 9 14 0 Any 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • these subframes (possibly including prach-StartingSubframe) then define the access opportunities over which the PRACH load can be spread (i.e., for a given UE, only a subset of these subframes would be a valid).
  • UE_ID could be any (quasi) random UE identity used in the network, e.g., S-TMSI or IMSI. In one embodiment, IMSI is used, since it is known in the eNB already and random enough for providing even paging load distribution in existing standard and networks.
  • the remaining step of deciding which prach group index are allowed for a UE, based on the UE_ID, is the same as described for eMTC above.
  • the method starts by defining/configuring the length of the spreading period, i.e., due to requirements on maximum delay that could be of interest.
  • This approach is similar to that outlined above, with the main difference being that the number of PRACH groups/occurrences over which the load is spread depends on the (N)PRACH periodicity, i.e. on prach-ConfigurationIndex or nprach-Periodicity.
  • a UE Subscriber Identity Module (SIM) or Universal SIM (USIM) is configured with a random access class in the range 0 to 9 and may in addition be configured with one special access class selected from the range 11 to 15.
  • the meanings of the special classes are presented in Table 2.
  • Table 2 3GPP special access classes (see 3GPP TS 22.011 V15.2.0).
  • the selected random access occurrence is based on the random access class instead of the UE ID.
  • the selected random access occurrence and its periodicity is selected based on the special access class configuration.
  • the activation of the functionality described herein is based on the special access class configuration.
  • the activation of this feature is hence made dependent on the PLMN used by the UE.
  • a number of access establishment causes are supported.
  • the LTE and NB-loT RRC specifications present access causes such as ⁇ emergency', 'high priority', and 'delay tolerant'.
  • the activation and configuration of the features described herein are dependent on the access establishment cause.
  • NB-loT For NB-loT, two types of UE reporting are defined: 'normal reporting' and 'exception reporting'. In one embodiment, the activation and configuration of the feature described herein is dependent on the NB-loT reporting type.
  • the eNB does not necessarily need to know in which access opportunities/(N)PRACH occurrences the UE is allowed to access. It may be beneficial to have such information, for example, to control the UE, ensure that its behavior is standard-compliant, and prevent access when the UE should not. However, if this is not the case, the eNB could in some cases be unaware of whether a UE is using the feature. In that case, the access opportunity/(N)PRACH occurrence in which the UE is allowed to access could be determined by random draw. This is illustrated in Figure 2C , where the access opportunity/(N)PRACH load is spread over four occasions and the UE draws a random number equal to three.
  • the periodic index can either be explicit, e.g., indicated in the (N)PRACH configuration, or implicit, e.g., indexed periodically depending on the configuration parameter which determines how many access opportunities/(N)PRACH occurrences over which the UE should be load distributed.
  • SFN system frame number
  • Hyper-SFN could be used in a similar way.
  • the PRACH occurrences are identified by the subframe, such that e.g.
  • the indexing works exactly as described above under ⁇ (N)PRACH-based,' but the UE selection of an occurrence is based on UE_ID but instead on a random draw in the range of indexes for the (N)PRACH distribution group indexes.
  • the UE does the random-draw per access attempt; in another embodiment it persists over a longer period of time.
  • UMTS Universal Mobile Telecommunications System
  • the Access Class Barring (ACB) in LTE defines a threshold for random draw (in SystemInformationBlockType2): SystemlnformationBlockType2 field descriptions ac-BarringFactor If the random number drawn by the UE is lower than this value, access is allowed. Otherwise the access is barred.
  • differentiation for the barring is for any of the following, or any combination thereof:
  • the random selection is biased for any of the above criteria.
  • weights are used to have a non-uniform random selection for the above.
  • some UE category, home PLMN, or QCI may be prioritized.
  • the access opportunities are not defined as different (N)PRACH occurrences, but rather a time period and all the (N)PRACH occurrences therein belong to the same access opportunity and have the same access opportunity index.
  • N 4
  • the UE access opportunity index selection based on UE_ID or random draw in different embodiments.
  • any time period can be used, e.g. a radio frame (some overlap with the subframe-centric alternative described above for eMTC), Hyper-SFN, BCCH modification period, or any other time period.
  • a UE Before accessing the NB-loT or LTE-M system, a UE is required to assess its coverage enhancement (CE) level. Based on this, it selects an (N)PRACH CE level.
  • CE coverage enhancement
  • the configuration of the random access occurrence parameters e.g. the periodicity
  • the selection of random access occurrence is dependent on the UE CE level.
  • the (N)PRACH load distribution method described here will increase latency, since a UE may not be allowed to transmit in the first upcoming (N)PRACH occurrence when data arrives in its buffer but will have to wait somewhat for an allowed occurrence. In general, this is not a problem since most MTC applications are delay tolerant by nature, e.g. , in high CE only the data part can take several seconds, so adding a number of milliseconds is not a concern in most cases (even for alarms, a latency on the order of seconds must be expected when using MTC). However, there may still be cases where it is not desirable to add to the already high latency, and therefore it is important to have configurability for the access methods described herein.
  • any UE for which the (N)PRACH load distribution is not configured will use any access opportunity/(N)PRACH occurrence, there is no need to have a biased selection for the remaining UEs using the load distribution.
  • the first UE will select any one of them, whichever comes first in time, and randomly distributing the remaining load for the other UEs will ensure an even load for the access opportunities/(N)PRACH occurrences (assuming there is no traffic pattern for the UEs not configured with the load distribution which correlates with the access opportunity/(N)PRACH occurrence periodicity).
  • the configuration of (N)PRACH load distribution is UE-specific. That is, the eNB configures the UE to apply (N)PRACH load distribution or not, e.g ., by dedicated RRC signaling.
  • configuration is ther valid in the current cell until re-configured.
  • the configuration is valid in the entire network, in which case, after configuring the UE with (N)PRACH load distribution, the eNB notifies the Mobility Management Entity (MME) about this configuration over S1-AP signaling for storing the UE context.
  • MME Mobility Management Entity
  • storage of the configuration is a Radio Access Network (RAN) feature.
  • RAN Radio Access Network
  • the configuration is either only stored in the UE context in MME for long-term keeping when the UE goes to RRC_IDLE; stored in the UE context when RRC Suspend/Resume solution is used (i.e ., CloT user-plane optimization); or only stored in the UE (a new eNB will have to poll the UE to receive the current configuration).
  • storage of the configuration is a MME feature, where the MME decides whether or not (N)PRACH load distribution is applied for a certain UE and notifies this to the UE over Non-Access Stratum (NAS) signaling.
  • NAS Non-Access Stratum
  • the decision for the configuration of (N)PRACH load distribution for a particular UE is based on any of the following (or combination thereof): UE subscription type, UE traffic profile, UE latency requirement, QoS/CQI typically used, UE application type, UE CE-level, (N)PRACH configuration in the cell, whether the UE is using the Rel-15 feature Early Data Transmission, etc.
  • the UE latency requirement is further application specific. Certain application may require the uplink data to be delivered within the next minute, hour, or day.
  • the operation of determining access opportunity for the UE e.g. , SFN mod N, may further have the value N be determined based on the application, or UE-dependent latency requirement.
  • Configuration per cell It may be desirable to be able to switch access load distribution on and off depending on conditions, e.g ., turning it on in certain cells or during certain times like busy hour. In one embodiment this is achieved by an indication in system information.
  • the indication may be implicit from the inclusion of the (N)PRACH load distribution configuration. That is, UEs (all, or the ones for which the feature is configured, see above) apply (N)PRACH load distribution whenever its optional configuration parameters and information elements (IEs) are provided in system information.
  • IEs information elements
  • SIB System Information Block
  • N number of access opportunities/(N)PRACH occurrences over which UEs should be distributed
  • N PRACH periodic load distribution index
  • Rel-15 Early Data Transmission specific configuration uplink time difference-of-arrival (UTDOA positioning) specific configuration
  • multi-tone specific configuration contention-based or contention-free random access differentiation
  • CE-level specific information etc.
  • the transmission of Msg1 takes longer since a higher number of repetitions are used, and therefore it might be desirable to have the possibility to configure the different CE-levels differently.
  • the configuration of the (N)PRACH load distribution can be done separately from activation of the feature.
  • the (N)PRACH load distribution can be configured either per-cell or per-UE.
  • the eNB can choose to activate the (N)PRACH load distribution in a later stage when necessary.
  • the (N)PRACH load distribution may be configured in the SI, but the activation is done after the UE's first (N)PRACH attempts, i.e., in the random access response message. In this way, the effort of updating the SI is minimized, which reduce the efforts for the UEs to retrieve the updated SI in a cell.
  • the (N)PRACH load distribution is also be activated at the same time when access barring is enabled in the cell. That is, when a UE noticed that if access barring is enabled in the cell, the system indicates the UE that are not barred should follow the (N)PRACH load distribution configurations. As access barring can be enabled quicker than updating the SI, this means the system can control the (N)PRACH load in a faster manner than updating the SI in the cell.
  • LoRa, Sigfox, and Ingenu may operate without a system frame structure. Furthermore, they operate based on grant-free uplink access in the sense that a device can transmit its uplink data at any time.
  • Figure 3 depicts a method 100, performed by a wireless device, for performing a temporally distributed network access procedure on an uplink carrier to access a wireless communication network.
  • Network access configuration information broadcast from the network, is received (block 102).
  • a subset of the plurality of possible access opportunities in which the wireless device is permitted to transmit network access signalling on the selected uplink carrier is determined (block 106).
  • Network access signalling is transmitted on the selected uplink carrier only during the subset of permitted access opportunities (block 108).
  • the method 100 further comprises selecting an uplink carrier on which to transmit the network access signalling (not shown).
  • Figure 4 depicts a method 200 of temporal network access load distribution, performed by a base station operative in a communication network in which a wireless device seeks access to the network on an uplink carrier.
  • Network access configuration information is broadcast (block 202).
  • Network access signalling is received on the uplink carrier from the wireless device only during a subset of a plurality of possible access opportunities, in the time domain, in which the wireless device is permitted to perform access, the subset determined by the wireless device (block 204).
  • the apparatuses described above may perform the methods 100, 200 herein and any other processing by implementing any functional means, modules, units, or circuitry.
  • the apparatuses comprise respective circuits or circuitry configured to perform the steps shown in the method figures.
  • the circuits or circuitry in this regard may comprise circuits dedicated to performing certain functional processing and/or one or more microprocessors in conjunction with memory.
  • the circuitry may include one or more microprocessor or microcontrollers, as well as other digital hardware, which may include digital signal processors (DSPs), special-purpose digital logic, and the like.
  • DSPs digital signal processors
  • the processing circuitry may be configured to execute program code stored in memory, which may include one or several types of memory such as read-only memory (ROM), random-access memory, cache memory, flash memory devices, optical storage devices, etc.
  • Program code stored in memory may include program instructions for executing one or more telecommunications and/or data communications protocols as well as instructions for carrying out one or more of the techniques described herein, in several embodiments.
  • the memory stores program code that, when executed by the one or more processors, carries out the techniques described herein.
  • FIG. 5 for example illustrates a wireless device 10.
  • a wireless device 10 is any type device capable of communicating with a network node and/or access point using radio signals.
  • a wireless device 10 may therefore refer to a machine-to-machine (M2M) device, a machine-type communications (MTC) device, a Narrowband Internet of Things (NB loT) device, etc.
  • M2M machine-to-machine
  • MTC machine-type communications
  • the wireless device 10 may also be referred to as a User Equipment (UE), such as a cellular telephone or "smartphone," however, the term UE should be understood to encompass any wireless device 10.
  • UE User Equipment
  • a wireless device 10 may also be referred to as a radio device, a radio communication device, a wireless device, a wireless terminal, or simply a terminal - unless the context indicates otherwise, the use of any of these terms is intended to include device-to-device UEs or devices, machine-type devices, or devices capable of machine-to-machine communication, sensors equipped with a wireless device, wireless-enabled table computers, mobile terminals, smart phones, laptop-embedded equipped (LEE), laptop-mounted equipment (LME), USB dongles, wireless customer-premises equipment (CPE), etc.
  • M2M machine-to-machine
  • MTC machine-type communication
  • wireless sensor and sensor may also be used. It should be understood that these devices, although referred to as UEs, but may be configured to transmit and/or receive data without direct human interaction.
  • the wireless device 10 includes a user interface 12 (display, touchscreen, keyboard or keypad, microphone, speaker, and the like); in other embodiments, such as in many M2M, MTC, or NB loT scenarios, the wireless device 10 may include only a minimal, or no, user interface 12 (as indicated by the dashed lines of block 12 in Figure 5 ).
  • the wireless device 10 also includes processing circuitry 14; memory 16; and communication circuitry 18 connected to one or more antennas 20, to effect wireless communication across an air interface to one or more radio network nodes, such as a base station, and/or access points.
  • the antenna(s) 20 may protrude externally from the wireless device 10, or the antenna(s) 20 may be internal.
  • a wireless device 10 may include a sophisticated user interface 32, and may additionally include features such as a camera, accelerometer, satellite navigation signal receiver circuitry, vibrating motor, and the like (not depicted in Fig. 5 ).
  • the memory 16 is operative to store, and the processing circuitry 14 operative to execute, software which when executed is operative to cause the wireless device 10 to perform network access signaling according to a temporal network access load distribution scheme, in which its opportunities to transmit network access signaling are limited.
  • the software when executed on the processing circuitry 14, is operative to perform the method 100 described and claimed herein.
  • the processing circuitry 14 in this regard may implement certain functional means, units, or modules.
  • Figure 6 illustrates a schematic block diagram of a wireless device 30 in a wireless network.
  • the wireless device 30 implements various functional means, units, or modules, e.g., via the processing circuitry 14 in Figure 5 and/or via software code.
  • These functional means, units, or modules, e.g., for implementing the method(s) herein, include for instance: a network access configuration information receiving unit 32, a possible access opportunities determining unit 34, a permitted access opportunities determining unit 36, and a network access signalling transmitting unit 38.
  • the network access configuration information receiving unit 32 is configured to receive network access configuration information broadcast from the network.
  • the possible access opportunities determining unit 34 is configured to determine a plurality of access opportunities, in the time domain, on which network access signalling is possible on the selected uplink carrier.
  • the permitted access opportunities determining unit 36 is configured to, based on the network access configuration information and one of a parameter of the wireless device and a random parameter, determine a subset of the plurality of possible access opportunities in which the wireless device is permitted to transmit network access signalling on the selected uplink carrier.
  • the network access signalling transmitting unit 38 is configured to transmit network access signalling on the selected uplink carrier only during the subset of permitted access opportunities.
  • the wireless device 30 further includes an uplink carrier selecting unit (not shown) configured to select an uplink carrier on which to transmit network access signalling.
  • FIG. 7 depicts a base station 50 operative in a wireless communication network.
  • the base station 50 includes processing circuitry 52; memory 54; and communication circuitry 56 connected to one or more antennas 60, to effect wireless communication across an air interface to one or more wireless devices 10.
  • the antenna(s) 60 may be physically located separately from the base station 50, such as mounted on a tower, building, or the like.
  • the memory 56 is depicted as being internal to the processing circuitry 54, those of skill in the art understand that the memory 56 may also be external.
  • virtualization techniques allow some functions nominally executed by the processing circuitry 54 to actually be executed by other hardware, perhaps remotely located ( e.g ., in the so-called “cloud").
  • the base station 50 is known in LTE as a eNodeB or eNB, and in New Radio (NR) as gNB. In general, in other wireless communication networks, the base station 50 may be known as a Radio Base Station, Base Transceiver Station, Access Point, or the like.
  • the processing circuitry 54 is operative to cause the base station 50 to perform temporal network access load distribution, by which network access attempts by wireless devices 10 on an uplink carrier are distributed in time, avoiding massive simultaneous access attempts.
  • the processing circuitry 54 is operative to perform the method 200 described and claimed herein.
  • the processing circuitry 54 in this regard may implement certain functional means, units, or modules.
  • Figure 8 illustrates a schematic block diagram of a base station 70 in a wireless network.
  • the base station 72 implements various functional means, units, or modules, e.g ., via the processing circuitry 52 in Figure 7 and/or via software code.
  • These functional means, units, or modules, e.g ., for implementing the method 200 herein, include for instance: network access configuration information broadcasting unit 72 and network access signalling receiving unit 74.
  • the network access configuration information broadcasting unit 72 is configured to broadcast network access configuration information.
  • the network access signalling receiving unit 74 is configured to receive, on the uplink carrier, network access signalling from the wireless device only during a subset of a plurality of possible access opportunities, in the time domain, in which the wireless device is permitted to perform access, the subset determined by the wireless device.
  • a computer program comprises instructions which, when executed on at least one processor of an apparatus, cause the apparatus to carry out any of the respective processing described above.
  • a computer program in this regard may comprise one or more code modules corresponding to the means or units described above.
  • Embodiments, not claimed, further include a carrier containing such a computer program.
  • This carrier may comprise one of an electronic signal, optical signal, radio signal, or computer readable storage medium.
  • embodiments not claimed, herein also include a computer program product stored on a non-transitory computer readable (storage or recording) medium and comprising instructions that, when executed by a processor of an apparatus, cause the apparatus to perform as described above.
  • Embodiments, not claimed, further include a computer program product comprising program code portions for performing the steps of any of the embodiments herein when the computer program product is executed by a computing device.
  • This computer program product may be stored on a computer readable recording medium.
  • Embodiments, not claimed, provide numerous advantages over the prior art.
  • the number of the simultaneous access attempts by MTC UEs is reduced, and consequently the maximal (N)PRACH load seen at the eNB is reduced. This prevents Random Access congestion, without the need for explicit signaling. Further, it lowers the processing requirements in eNB and the collision probability per access attempt, leading to reduced power consumption for the UE.
  • the present disclosure is discussed herein with reference to LTE, NR, LTE-M, and NB-loT, e.g. , referring to UEs, (N)PRACH, and the like, the disclosure is not limited to these standardized wireless communication network protocols. Rather, the present disclosure may be advantageously deployed in any wireless communication network in which a large number of wireless devices may attempt network access simultaneously, such as due to a commonly-experienced event, or due to common software. As such, those of skill in the art will understand that the claims are to be construed broadly - for example, the term “base station” encompasses any wireless network node that serves as an access point, or RAN terminal, for wireless communication with wireless devices. As used herein, the phrase "one of A and B" means the logical OR of A and B (as opposed to XOR), and is satisfied by one or more A without B, one or more B without A, or any number of A together with any number of B.
  • any appropriate steps, methods, features, functions, or benefits disclosed herein may be performed through one or more functional units or modules of one or more virtual apparatuses.
  • Each virtual apparatus may comprise a number of these functional units.
  • These functional units may be implemented via processing circuitry, which may include one or more microprocessor or microcontrollers, as well as other digital hardware, which may include digital signal processors (DSPs), special-purpose digital logic, and the like.
  • the processing circuitry may be configured to execute program code stored in memory, which may include one or several types of memory such as read-only memory (ROM), random-access memory (RAM), cache memory, flash memory devices, optical storage devices, etc.
  • Program code stored in memory includes program instructions for executing one or more telecommunications and/or data communications protocols as well as instructions for carrying out one or more of the techniques described herein.
  • the processing circuitry may be used to cause the respective functional unit to perform corresponding functions according one or more embodiments of the present disclosure.
  • the term unit may have conventional meaning in the field of electronics, electrical devices and/or electronic devices and may include, for example, electrical and/or electronic circuitry, devices, modules, processors, memories, logic solid state and/or discrete devices, computer programs or instructions for carrying out respective tasks, procedures, computations, outputs, and/or displaying functions, and so on, as such as those that are described herein.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (8)

  1. Procédé (100) réalisé par un dispositif sans fil (10) pour réaliser une procédure d'accès de réseau à distribution dans le temps sur une porteuse de liaison montante pour accéder à un réseau de communication sans fil, le procédé (100) comprenant :
    la réception (102) d'informations de configuration d'accès de réseau diffusées depuis le réseau ;
    la détermination (104) d'une pluralité d'opportunités d'accès, dans le domaine de temps, au cours desquelles une signalisation d'accès de réseau est possible sur la porteuse de liaison montante ;
    le tirage d'un nombre aléatoire dans la plage d'indices des opportunités d'accès ;
    sur la base des informations de configuration d'accès de réseau et de l'un parmi un identifiant unique du dispositif sans fil (10) et le nombre aléatoire, la division de toutes les périodes de temps de trame de liaison montante en un nombre n prédéterminé de sous-ensembles, la sélection d'un indice définissant l'un des n sous-ensembles sur la base de l'identifiant unique du dispositif sans fil ou du nombre aléatoire et la détermination du sous-ensemble de la pluralité d'opportunités d'accès possibles au cours desquelles le dispositif sans fil (10) est autorisé à transmettre une signalisation d'accès de réseau pour être toutes les opportunités d'accès au cours d'occurrences de l'indice sélectionné de périodes de temps de trame de liaison montante ; et
    la transmission (108) d'une signalisation d'accès de réseau sur la porteuse de liaison montante uniquement pendant le sous-ensemble d'opportunités d'accès autorisées.
  2. Procédé (100) selon la revendication 1, dans lequel les informations de configuration d'accès de réseau comprennent une indication qu'une distribution de charge d'accès de réseau dans le temps est active.
  3. Procédé (100) selon la revendication 1, dans lequel l'identifiant unique est une identité internationale d'abonné mobile du dispositif sans fil (10).
  4. Procédé (100) selon la revendication 1, dans lequel la division de toutes les périodes de temps de trame de liaison montante en un nombre n prédéterminé de sous-ensembles comprend le calcul de
    SFN mod n = m, où
    SFN est un nombre de sous-trames des sous-trames de liaison montante ;
    n est le nombre prédéterminé de sous-ensembles de sous-trames ; et
    m est un indice identifiant l'un des n sous-ensembles de sous-trames.
  5. Procédé (100) selon la revendication 1, dans lequel la sélection d'un indice définissant l'un des n sous-ensembles sur la base d'un paramètre du dispositif sans fil comprend le calcul de
    ID mod n = I, où
    ID est un identifiant unique du dispositif sans fil (10) ;
    n est le nombre prédéterminé de sous-ensembles de sous-trames ; et
    I est l'indice sélectionné identifiant l'un des n sous-ensembles de sous-trames.
  6. Procédé (100) selon la revendication 1, dans lequel un paramètre du dispositif sans fil (10) est l'un parmi une classe d'accès aléatoire, une classe d'accès spécial, un réseau mobile terrestre public utilisé par le dispositif sans fil (10), une cause d'établissement d'accès du dispositif sans fil (10), un type de rapport NB-IoT comprenant normal ou d'exception, et un entier aléatoire à l'intérieur de la plage des sous-ensembles d'opportunités d'accès.
  7. Procédé (100) selon la revendication 1, dans lequel
    la réception (102) d'informations de configuration d'accès de réseau diffusées depuis le réseau comprend la réception des informations de configuration dans une diffusion d'informations système ; et
    la transmission (108) d'une signalisation d'accès de réseau sur la porteuse de liaison montante comprend la transmission d'un préambule d'accès aléatoire sur la porteuse de liaison montante.
  8. Dispositif sans fil (10) fonctionnel pour réaliser une procédure d'accès de réseau à distribution dans le temps sur une porteuse de liaison montante pour accéder à un réseau de communication sans fil, comprenant :
    une circuiterie de communication (18) ; et
    une circuiterie de traitement (14) reliée fonctionnellement à la circuiterie de communication (18), et fonctionnelle pour
    recevoir (102) des informations de configuration d'accès de réseau diffusées depuis le réseau ;
    déterminer (104) une pluralité d'opportunités d'accès, dans le domaine de temps, au cours desquelles il est possible de transmettre une signalisation d'accès de réseau sur la porteuse de liaison montante ;
    tirer un nombre aléatoire dans la plage d'indices des opportunités d'accès ;
    sur la base des informations de configuration d'accès de réseau et de l'un parmi un identifiant unique du dispositif sans fil et le nombre aléatoire, diviser toutes les périodes de temps de trame de liaison montante en un nombre n prédéterminé de sous-ensembles, sélectionner un indice définissant l'un des n sous-ensembles sur la base de l'identifiant unique du dispositif sans fil ou du nombre aléatoire, et déterminer le sous-ensemble de la pluralité d'opportunités d'accès possibles au cours desquelles le dispositif sans fil (10) est autorisé à transmettre une signalisation d'accès de réseau pour être toutes les opportunités d'accès au cours d'occurrences de l'indice sélectionné de périodes de temps de trame de liaison montante ; et
    transmettre (108) une signalisation d'accès de réseau sur la porteuse de liaison montante uniquement pendant le sous-ensemble d'opportunités d'accès autorisées.
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US20200314910A1 (en) 2020-10-01

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